Time and potentially some filing/service costs. You may be able to claim some of those as well (When I almost had to sue for a security deposit, in that Jurisdiction I could get some filing fees but not service costs for whatever reason...)
That said, if they don't show up, you'll get a default judgement. And if TM doesn't pay, they can have fun with it if there is an office nearby. A while back someone got a judgement against a bank, they didn't pay out. He came by with the sheriff and they started loading up chairs/etc when they hesitated to cut a check. :)
Or, whatever other 'collection' action you may have to motion for after the fact if they don't pay.
At least where I live (Texas, United States) from what I saw it's allowed to have legal counsel, although it may be uncommon. I'll have to look into the process more and see if there's anything I can pursue.
I vaguely recall in california you can opt-out of arbitration within 30 days of a contract. don't know if there are details or if that is still the case.
> Legal counsel isn't allowed in small claims courts.
That's only true in a handful of states. Most allow you to bring a lawyer.
Small claims courts will generally have simpler and friendlier procedures so that even if a lawyer is allowed you will be fine without one in most cases.
edit: Ha! Here is a guide on how to sue Ticketmaster: https://fairshake.com/ticketmaster/how-to-sue/